layui.define('jquery', function(exports){
    var $ = layui.jquery;

    var obj = {
        init: function(options) {
            requirejs.config({
                baseUrl: '/vendor/webuploader/',
                paths: {
                    jquery: './jquery'
                }
            });

            require([ 'webuploader' ], function( WebUploader ) {
                // 当domReady的时候开始初始化
                $(function() {
                    var $wrap = $('#' + options.uploader),

                        // 图片容器
                        $queue = $( '<ul class="filelist"></ul>' )
                            .appendTo( $wrap.find( '.queueList' ) ),

                        // 状态栏，包括进度和控制按钮
                        $statusBar = $wrap.find( '.statusBar' ),

                        // 文件总体选择信息。
                        $info = $statusBar.find( '.info' ),

                        // 上传按钮
                        $upload = $wrap.find( '.uploadBtn' ),

                        // 没选择文件之前的内容。
                        $placeHolder = $wrap.find( '.placeholder' ),

                        $progress = $statusBar.find( '.progress' ).hide(),

                        // 添加的文件数量
                        fileCount = 0,

                        // 添加的文件总大小
                        fileSize = 0,

                        // 优化retina, 在retina下这个值是2
                        ratio = window.devicePixelRatio || 1,

                        // 缩略图大小
                        thumbnailWidth = 110 * ratio,
                        thumbnailHeight = 110 * ratio,

                        // 可能有pedding, ready, uploading, confirm, done.
                        state = 'pedding',

                        // 所有文件的进度信息，key为file id
                        percentages = {},

                        supportTransition = (function(){
                            var s = document.createElement('p').style,
                                r = 'transition' in s ||
                                      'WebkitTransition' in s ||
                                      'MozTransition' in s ||
                                      'msTransition' in s ||
                                      'OTransition' in s;
                            s = null;
                            return r;
                        })(),

                        // WebUploader实例
                        uploader;

                    // 实例化
                    uploader = WebUploader.create({
                        pick: {
                            id: options.filePicker? ('#'+options.filePicker) : '#filePicker',
                            label: '点击选择图片'
                        },
                        dnd: options.dnd ? ('#'+options.dnd) : '#dndArea',
                        paste: options.paste ? ('#'+options.paste) : '#uploader',
                        swf: '/vendor/webuploader/Uploader.swf',
                        chunked: true,
                        // runtimeOrder: 'flash',
                        sendAsBinary: true,
                        server: '/backstage/api/batchupload',
                        // server: 'http://liaoxuezhi.fe.baidu.com/webupload/fileupload.php',
                        // server: 'http://www.2betop.net/fileupload.php',
                        fileNumLimit: 300,
                        fileSizeLimit: 200 * 1024 * 1024,    // 200 M
                        fileSingleSizeLimit: 50 * 1024 * 1024    // 50 M
                    });

                    // 添加“添加文件”的按钮，
                    uploader.addButton({
                        id: '#' + options.addButton,
                        label: '继续添加'
                    });

                    // 当有文件添加进来时执行，负责view的创建
                    function addFile( file ) {
                        var $li = $( '<li id="' + file.id + '">' +
                                '<p class="title">' + file.name + '</p>' +
                                '<p class="imgWrap"></p>'+
                                '<p class="progress"><span></span></p>' +
                                '</li>' ),

                            $btns = $('<div class="file-panel">' +
                                '<span class="cancel">删除</span>' +
                                '<span class="rotateRight">向右旋转</span>' +
                                '<span class="rotateLeft">向左旋转</span></div>').appendTo( $li ),
                            $prgress = $li.find('p.progress span'),
                            $wrap = $li.find( 'p.imgWrap' ),
                            $info = $('<p class="error"></p>'),

                            showError = function( code ) {
                                switch( code ) {
                                    case 'exceed_size':
                                        text = '文件大小超出';
                                        break;

                                    case 'interrupt':
                                        text = '上传暂停';
                                        break;

                                    default:
                                        text = '上传失败，请重试';
                                        break;
                                }

                                $info.text( text ).appendTo( $li );
                            };

                        if ( file.getStatus() === 'invalid' ) {
                            showError( file.statusText );
                        } else {
                            // @todo lazyload
                            $wrap.text( '预览中' );
                            uploader.makeThumb( file, function( error, src ) {
                                if ( error ) {
                                    $wrap.text( '不能预览' );
                                    return;
                                }

                                var img = $('<img src="'+src+'">');
                                $wrap.empty().append( img );
                            }, thumbnailWidth, thumbnailHeight );

                            percentages[ file.id ] = [ file.size, 0 ];
                            file.rotation = 0;
                        }

                        file.on('statuschange', function( cur, prev ) {
                            if ( prev === 'progress' ) {
                                $prgress.hide().width(0);
                            } else if ( prev === 'queued' ) {
                                $li.off( 'mouseenter mouseleave' );
                                $btns.remove();
                            }

                            // 成功
                            if ( cur === 'error' || cur === 'invalid' ) {
                                console.log( file.statusText );
                                showError( file.statusText );
                                percentages[ file.id ][ 1 ] = 1;
                            } else if ( cur === 'interrupt' ) {
                                showError( 'interrupt' );
                            } else if ( cur === 'queued' ) {
                                percentages[ file.id ][ 1 ] = 0;
                            } else if ( cur === 'progress' ) {
                                $info.remove();
                                $prgress.css('display', 'block');
                            } else if ( cur === 'complete' ) {
                                $li.append( '<span class="success"></span>' );
                            }

                            $li.removeClass( 'state-' + prev ).addClass( 'state-' + cur );
                        });

                        $li.on( 'mouseenter', function() {
                            $btns.stop().animate({height: 30});
                        });

                        $li.on( 'mouseleave', function() {
                            $btns.stop().animate({height: 0});
                        });

                        $btns.on( 'click', 'span', function() {
                            var index = $(this).index(),
                                deg;

                            switch ( index ) {
                                case 0:
                                    uploader.removeFile( file );
                                    return;

                                case 1:
                                    file.rotation += 90;
                                    break;

                                case 2:
                                    file.rotation -= 90;
                                    break;
                            }

                            if ( supportTransition ) {
                                deg = 'rotate(' + file.rotation + 'deg)';
                                $wrap.css({
                                    '-webkit-transform': deg,
                                    '-mos-transform': deg,
                                    '-o-transform': deg,
                                    'transform': deg
                                });
                            } else {
                                $wrap.css( 'filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ (~~((file.rotation/90)%4 + 4)%4) +')');
                                // use jquery animate to rotation
                                // $({
                                //     rotation: rotation
                                // }).animate({
                                //     rotation: file.rotation
                                // }, {
                                //     easing: 'linear',
                                //     step: function( now ) {
                                //         now = now * Math.PI / 180;

                                //         var cos = Math.cos( now ),
                                //             sin = Math.sin( now );

                                //         $wrap.css( 'filter', "progid:DXImageTransform.Microsoft.Matrix(M11=" + cos + ",M12=" + (-sin) + ",M21=" + sin + ",M22=" + cos + ",SizingMethod='auto expand')");
                                //     }
                                // });
                            }


                        });

                        $li.appendTo( $queue );
                    }

                    // 负责view的销毁
                    function removeFile( file ) {
                        var $li = $('#'+file.id);

                        delete percentages[ file.id ];
                        updateTotalProgress();
                        $li.off().find('.file-panel').off().end().remove();
                    }

                    function updateTotalProgress() {
                        var loaded = 0,
                            total = 0,
                            spans = $progress.children(),
                            percent;

                        $.each( percentages, function( k, v ) {
                            total += v[ 0 ];
                            loaded += v[ 0 ] * v[ 1 ];
                        } );

                        percent = total ? loaded / total : 0;

                        spans.eq( 0 ).text( Math.round( percent * 100 ) + '%' );
                        spans.eq( 1 ).css( 'width', Math.round( percent * 100 ) + '%' );
                        updateStatus();
                    }

                    function updateStatus() {
                        var text = '', stats;

                        if ( state === 'ready' ) {
                            text = '选中' + fileCount + '张图片，共' +
                                    WebUploader.formatSize( fileSize ) + '。';
                        } else if ( state === 'confirm' ) {
                            stats = uploader.getStats();
                            if ( stats.uploadFailNum ) {
                                text = '已成功上传' + stats.successNum+ '张照片至XX相册，'+
                                    stats.uploadFailNum + '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
                            }

                        } else {
                            stats = uploader.getStats();
                            text = '共' + fileCount + '张（' +
                                    WebUploader.formatSize( fileSize )  +
                                    '），已上传' + stats.successNum + '张';

                            if ( stats.uploadFailNum ) {
                                text += '，失败' + stats.uploadFailNum + '张';
                            }
                        }

                        $info.html( text );
                    }

                    function setState( val ) {
                        var file, stats;

                        if ( val === state ) {
                            return;
                        }

                        $upload.removeClass( 'state-' + state );
                        $upload.addClass( 'state-' + val );
                        state = val;

                        switch ( state ) {
                            case 'pedding':
                                $placeHolder.removeClass( 'element-invisible' );
                                $queue.hide();
                                $statusBar.addClass( 'element-invisible' );
                                uploader.refresh();
                                break;

                            case 'ready':
                                $placeHolder.addClass( 'element-invisible' );
                                $( '#' + options.addButton ).removeClass( 'element-invisible');
                                $queue.show();
                                $statusBar.removeClass('element-invisible');
                                uploader.refresh();
                                break;

                            case 'uploading':
                                $( '#' + options.addButton ).addClass( 'element-invisible' );
                                $progress.show();
                                $upload.text( '暂停上传' );
                                break;

                            case 'paused':
                                $progress.show();
                                $upload.text( '继续上传' );
                                break;

                            case 'confirm':
                                $progress.hide();
                                $upload.text( '开始上传' ).addClass( 'disabled' );

                                stats = uploader.getStats();
                                if ( stats.successNum && !stats.uploadFailNum ) {
                                    setState( 'finish' );
                                    return;
                                }
                                break;
                            case 'finish':
                                stats = uploader.getStats();
                                if ( stats.successNum ) {
                                    alert( '上传成功' );
                                } else {
                                    // 没有成功的图片，重设
                                    state = 'done';
                                    location.reload();
                                }
                                break;
                        }

                        updateStatus();
                    }

                    uploader.onUploadProgress = function( file, percentage ) {
                        var $li = $('#'+file.id),
                            $percent = $li.find('.progress span');

                        $percent.css( 'width', percentage * 100 + '%' );
                        percentages[ file.id ][ 1 ] = percentage;
                        updateTotalProgress();
                    };

                    uploader.onFileQueued = function( file ) {
                        fileCount++;
                        fileSize += file.size;

                        if ( fileCount === 1 ) {
                            $placeHolder.addClass( 'element-invisible' );
                            $statusBar.show();
                        }

                        addFile( file );
                        setState( 'ready' );
                        updateTotalProgress();
                    };

                    uploader.on( 'uploadSuccess', function( file ) {
                        var successfiles = $('#' +options.successfiles).val();

                        if (successfiles == '') {
                            successfiles = successfiles + file.name;
                        } else {
                            successfiles = successfiles + ',' + file.name;
                        }
                        $('#'+options.successfiles).val(successfiles);
                    });

                    uploader.onFileDequeued = function( file ) {
                        fileCount--;
                        fileSize -= file.size;

                        if ( !fileCount ) {
                            setState( 'pedding' );
                        }

                        removeFile( file );
                        updateTotalProgress();

                    };

                    uploader.on( 'all', function( type ) {
                        var stats;
                        switch( type ) {
                            case 'uploadFinished':
                                setState( 'confirm' );
                                break;

                            case 'startUpload':
                                setState( 'uploading' );
                                break;

                            case 'stopUpload':
                                setState( 'paused' );
                                break;

                        }
                    });

                    uploader.onError = function( code ) {
                        alert( 'Eroor: ' + code );
                    };

                    $upload.on('click', function() {
                        if ( $(this).hasClass( 'disabled' ) ) {
                            return false;
                        }

                        if ( state === 'ready' ) {
                            uploader.upload();
                        } else if ( state === 'paused' ) {
                            uploader.upload();
                        } else if ( state === 'uploading' ) {
                            uploader.stop();
                        }
                    });

                    $info.on( 'click', '.retry', function() {
                        uploader.retry();
                    } );

                    $info.on( 'click', '.ignore', function() {
                        alert( 'todo' );
                    } );

                    $upload.addClass( 'state-' + state );
                    updateTotalProgress();
                });
            });

        }
    };
    exports('multifileuploader', obj);
});
